package cn.tedu.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {
    //设置过滤器的类型： pre routing post error
    @Override
    public String filterType() {
        return "pre";
    }
    //位置序号
    @Override
    public int filterOrder() {
        return 6;
    }
    //判断针对当前请求，是否执行过滤代码
    @Override
    public boolean shouldFilter() {
        /*
        调用商品判断权限
        调用用户和订单不检查权限
         */
        //获得调用的服务id
        RequestContext ctx = RequestContext.getCurrentContext();
        String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);
        return "item-service".equals(serviceId);
    }
    //过滤代码
    @Override
    public Object run() throws ZuulException {
        //获得request对象 接收token参数
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        String token = request.getParameter("token");
        //如果没有token参数，阻止继续访问 直接返回响应
        //token==null || token.length()==0 || token.trim().length()==0
        if(StringUtils.isBlank(token)){
            ctx.setSendZuulResponse(false); //阻止继续访问
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","text/plain");
            ctx.setResponseBody("Not Login!");

        }
        //这个返回值不起任何作用
        return null;
    }
}
